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We demonstrate the conversion of cylindrically polarized laser beams in an orthogonal polarization state by introducing a high-order vortex phase singularity. Our theoretical and experimental investigations show that increasing the order of the phase singularity leads to effective generation of azimuthal polarization from radial polarization. These results demonstrate tight interrelation of the specific...
Two geometries are usually considered for direct laser writing of waveguide in glass that differ mainly from the way the sample is translated in regard to the laser beam propagation direction, namely transversely or longitudinally. In this contribution we report on waveguide of multi-core type composed of positive refractive index channel aligned on a hexagonal lattice and written using an alternative...
In this paper amplitude Fresnel zone plates (ZPs) with silver and chromium relief on silica glass are theoretically and experimentally investigated. Study of the focal spot characteristics versus the height of chromium and silver ring of ZP was carried out. It showed that the height of the relief of 70 nm allows to achieve an optimum ratio of the width and the intensity of the focal spot. Also, the...
Electrically tunable transformation of Bessel beams propagating along the optical axis of a barium-strontium niobate electro-optical crystal is theoretically investigated. Computer modeling showed the possibility of dynamic variation of the beam intensity at the output of an anisotropic crystal due to changes in refraction indices caused by the applied voltage. Controlling voltage required for the...
In this invited paper, a high-speed continuous-variable quantum key distribution (CV-QKD) system is investigated in the presence of atmospheric turbulence, which is enabled by employing the wavelength, polarization, and orbital angular momentum (OAM) states as degrees of freedom. Four-state discrete modulation is used for the key shaping for the convenience of easy generation, as well as to enhance...
We overview recent advances in the spatio-temporal nonlinear dynamics of optical pulses propagating in multimode optical fibers. The Kerr effect leads to spatial beam self-cleaning in a graded-index multimode optical fiber, followed by sideband series generation spanning multiple octaves. Effectively single mode supercontinuum spanning from the visible to the mid-infrared was also demonstrated. Enhancement...
The microchip lasers, being sources of coherent light, suffer from one serious drawback: low spatial quality of the beam, strongly reducing the brightness of emitted radiation. Attempts to improve the beam quality, such as pump-beam guiding, external feedback, either strongly reduce the emission power, or drastically increase the size and complexity of the lasers. Here we propose that specially designed...
In this article the composite author dealt with measurement possibilities of polarization states of light source emitting 1550 nm which was affected by atmospherically transmission environment in special acrylate box 2.5 m long. The Polarimeter Thorlabs TXP 5004 and the External Sensor Head PAN5710IR3 measured the changes of polarization parameters, ellipticity and azimuth, defining placement on the...
Silicon cluster superlattices, which have been generated by direct deposition of a silicon cluster beam with a monodisperse size distribution, give a just solution to bring forth new functional nanomaterials consistent with a sustainable society. Silicon clusters correctively form a unclosed-packed body centered cubic (bcc) superlattice structure with a lattice constant of 2.134±0.002 nm, retaining...
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